util: Use include_directories('..') instead include_directories('.') for inc_util

Movitaion

• So include util headers are always using util/ prefix in mesa code base
• This is a helper step for getting src/util to be self conatined, so it's can be used by down-stream projects easily
• Modular mesa components are easier to maintain
• expose src/util/ to include directory would cause easy file duplicate, for example there is two list.h in code base for example https://gitlab.freedesktop.org/mesa/mesa/-/blob/2c67457e5e10d5235b6368d97f3d1ef76c86d805/src/util/list.h and https://gitlab.freedesktop.org/mesa/mesa/-/blob/600c91fed89fb6c9389bcbdd41fe50893cfb984a/src/compiler/glsl/list.h

Signed-off-by: Yonggang Luo luoyonggang@gmail.com